【Java】设置千分位分隔符和保留n位小数

public class main {
	public static void main(String[] args) {
         float x = 18000;
         System.out.println(String.format("%.2f", x));//18000.00
         System.out.println(String.format("%,f", x));//18,000.000000
         System.out.println(String.format("%,.2f", x));//18,000.00
	}
}